Quote Originally Posted by LonerStoner
They should be under a light from the moment they burst through the soil, at this stage in their life, hey should be getting as much light as possible, a 20 hour day usually works pretty well. Just make sure that you keep them watered, and at the same time don't over-water! 250w should be fine if you're only growing a couple-three plants, any more than that and you're going to have problems when they get older with lanky plants stretching to get whatever light they can. I hope this helps.

Peace
many thanks for your help